Revert r54082 "ruby.c: load in binary mode"

DATA is expected to be text mode, but there is no ways to make a
FD to text mode from binary mode.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@54084 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ruby.c

@@ -1846,15 +1846,12 @@ open_load_file(VALUE fname_v, int *xflag)
 #else
 # define MODE_TO_LOAD (O_RDONLY)
 #endif
-	const int mode =
-#ifdef O_BINARY
-	    O_BINARY |
-#endif
-	    MODE_TO_LOAD;
+	int mode = MODE_TO_LOAD;
 #if defined DOSISH || defined __CYGWIN__
 	{
 	    const char *ext = strrchr(fname, '.');
 	    if (ext && STRCASECMP(ext, ".exe") == 0) {
+		mode |= O_BINARY;
 		*xflag = 1;
 	    }
 	}